The universe came together to make you and that is important. There is only one you and there can never be another you so tell me, if your friend or girlfriend or boyfriend or whatever has really given you the impression that you have been replaced then remember that there is only one them and you can always let that opportunity pass you by but they are missing out on a big opportunity to see someone who is one of a kind in this whole universe and that would be you. If they want to ignore you for someone else then I say fuck them. If they really can't see the differences or if they really struggle to find them then they don't deserve you and you especially don't deserve them.